Electromagnetic Wave Absorption Properties of Glass Fiber Reinforced Cement Filled with Carbon Black

2014 ◽  
Vol 912-914 ◽  
pp. 127-130 ◽  
Author(s):  
Yao Li Wei ◽  
Yue Fang Zhang ◽  
Wang Jun Hao
Keyword(s):  
Carbon Black ◽  
Electromagnetic Radiation ◽  
Glass Fiber ◽  
High Frequency ◽  
Frequency Range ◽  
Absorption Properties ◽  
Testing Method ◽  
Glass Fiber Reinforced ◽  
New Material ◽  
Reinforced Cement

In order to deal with the more and more serious problem of electromagnetic radiation pollution, cement-based composites were prepared by introducing glass fiber into cement as through wave reagent and carbon black as absorbing reagent . Arched testing method were used to test the reflection losses in the frequency range of 2~18 GHz. The results showed that the absorption properties were improved in high frequency compared with the pure cement. The filling ratio of carbon black and glass fiber as well as the thickness of samples had influence on the absorption properties. The lowest reflection loss of-11.2 dB was obtained at 18 GHz of 9wt.% glass fiber and 5wt.% carbon black filled cement with thickness of 10mm. The new material can be used for building indoor electromagnetic radiation protection.

Electromagnetic Wave Absorption Properties of Cement Filled with Carbon Black

2014 ◽  
Vol 496-500 ◽  
pp. 2431-2434 ◽  
Author(s):  
Yue Fang Zhang ◽  
Wan Jun Hao ◽  
Yu Ping Duan ◽  
Shun Hua Liu
Keyword(s):  
Electromagnetic Wave ◽  
Dielectric Loss ◽  
Carbon Black ◽  
High Frequency ◽  
Filling Ratio ◽  
Frequency Range ◽  
Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
Testing Method ◽  
New Material

Using the dielectric loss property of carbon black , cement-based composites were prepared by introducing carbon black into cement. The reflection losses were studied using arched testing method in the frequency range of 2~18 GHz. The results showed that the absorption properties were improved in high frequency. The filling ratio of carbon black as well as the thickness of samples had influence on the absorption properties. The lowest reflection loss of-10.6 dB was obtained at 18 GHz of 5wt.% carbon black filled cement with thickness of 20mm. The new material can be used for building indoor electromagnetic radiation protection.

Electromagnetic Wave Absorbing Properties of Glass Fiber Reinforced Cement Composites with Special-Shaped Structure Surfaces

2013 ◽  
Vol 401-403 ◽  
pp. 614-618
Author(s):  
Yue Fang Zhang ◽  
Wan Jun Hao ◽  
Bao Yi Li ◽  
Yu Ping Duan ◽  
Shun Hua Liu
Keyword(s):  
Electromagnetic Wave ◽  
Glass Fiber ◽  
Building Materials ◽  
Impedance Matching ◽  
Cement Composites ◽  
Absorption Property ◽  
Frequency Range ◽  
Glass Fiber Reinforced ◽  
New Material ◽  
Reinforced Cement

In order to reach high electromagnetic wave absorption property, here we developed a cement composites building materials. Special-shaped structure surfaces have been designed to make the continuity change of impedance and increase the incident times for electromagnetic wave. Different ratio of flexible glass fiber were introduced to adjust the impedance matching characteristics of the composites and to attenuate the incident wave by scattering. As the concentration of 9% glass fiber and the surface of rectangle, the reflectivity reached the highest in the absorber with 20mm thickness. the lowest reflection loss of-15.8 dB was obtained at 8.9GHz, and the effective absorption bandwidth (less than-8 dB) reached 12 GHz in the frequency range of 1.7~18 GHz. The new material can be used for building indoor electromagnetic radiation protection.

Electromagnetic Wave Absorption Cement Based on Composited Absorbing Agent

2014 ◽  
Vol 1035 ◽  
pp. 520-523 ◽  
Author(s):  
Ye Sun ◽  
Yue Fang Zhang ◽  
Wan Jun Hao
Keyword(s):  
Electromagnetic Wave ◽  
Carbon Black ◽  
Electromagnetic Radiation ◽  
Glass Fiber ◽  
Radiation Protection ◽  
Reflection Loss ◽  
Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Electromagnetic Radiations

To solve more and more serious electromagnetic radiations, electromagnetic wave absorption cement were prepared by introducing carbon black and glass fiber as composited absorbing reagent, wich can be useful in building anechoic chamber and other electromagnetic radiation protection to buildings. The results showed that the absorption properties were improved compared with single absorbing agent such as carbon or glass fiber. the lowest reflection loss of-11.3dB was obtained at 18 GHz of 5wt.% carbon black and 9wt.% glass fiber filled cement with thickness of 20mm. The increase of thickness separately can not improve the absorption properties.

Electromagnetic Wave Absorption Properties and Mechanical Properties of Aramid Fiber Reinforced Cement

2012 ◽  
Vol 512-515 ◽  
pp. 2873-2877 ◽  
Author(s):  
Yue Fang Zhang ◽  
Bao Yi Li ◽  
Shun Hua Liu ◽  
Wan Jun Hao
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Breaking Strength ◽  
Aramid Fiber ◽  
Frequency Range ◽  
Absorption Properties ◽  
Space Network ◽  
Testing Method ◽  
Reinforced Cement ◽  
Electromagnetic Radiations

To solve more and more serious electromagnetic radiations, cement-based composites were prepared by introducing aramid fiber into cement. The reflection losses were studied using arched testing method in the frequency range of 1.7~18 GHz. The results showed that the absorption properties and mechanical properties were all improved preferably. The mechanisms were discussed, which indicated that the space network structure lapped into mutually by aramid fiber played an important role. The filling ratio of aramid fiber as well as the length of fiber had influence on the absorption properties, the breaking strength and the compressive strength of cement. The lowest reflection loss of -12.2 dB was obtained at 18 GHz, the effective absorption bandwidth (less than -8 dB) reached 9.15 GHz ,and the compressive strength was twice than that of cement paste when the specimen was filled with 8 vol. % aramid fiber with length of 3mm.

Strengthening of Prefab Slab using Fiber Reinforce Composites

2017 ◽  
Vol MCSP2017 (01) ◽  
pp. 27-29
Author(s):  
Gitanjali Biswal ◽  
Manoj Kumar Rath ◽  
Sagarika Panda
Keyword(s):  
Glass Fiber ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Structural Members ◽  
Load Bearing ◽  
Concrete Members ◽  
Shrinkage Cracks ◽  
Glass Fiber Reinforced ◽  
New Material ◽  
Fiber Reinforce

The main objective of using strengthening of pre fab slab by wraping with frp to to make it more durable during shock as a modification for the prevention of shrinkage cracks. The aim of research is to strengthening of Pre-fab structures slab using glass fiber reinforced composites. Slabs will act as structural members; provide a sensible application for the new material because they can be casted as load bearing and non-load bearing concrete members.

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